Don't go inside. Digging at wax or scratching an itch inside the ear canal with a hard object -- a pen cap or pencil, for example -- can cut your skin, making you more vulnerable to infection. Even using cotton-tipped sticks will disrupt the natural wax coating that protects against germs.

Ask your doctor about earplugs. Specially-designed temporary plugs can help keep moisture out of the ear canal.

Ask about eardrops. Over-the-counter antiseptic drops can help dry out the ear canal after swimming, especially if you feel water trapped inside your ear. Some people also use a homemade mix of alcohol and white vinegar. If you have frequent infections, your doctor may recommend trying lanolin ear drops before swimming.

Avoid polluted water. Stick to clean, well-maintained pools and follow health warnings at beaches. Be wary of lakes and ponds.

Know the symptoms. Swimmer's ear can cause ear pain, itching, a sensation of fullness in the ear canal, swollen lymph nodes, reddening of the outer ear, discomfort while chewing, fever and a discharge that may be clear, cloudy or yellowish.

Call a doctor. You'll need a prescription medication to heal swimmer's ear, often antibiotic drops. The sooner you start treatment, the better.